Yes, the Remington 7600 does have a bad reputation for reliability. I think there was a final iteration called the 750, where Remington changed the gas port angle and did some other tweaks to improve the functioning. I'm going to be a bit of a contrarian. I have a 7600, chambered for .308 Win. It has fed and cycled everything, even some reduced loads which shouldn't have cycled. I do keep it reasonably clean, but I've never been fussy about it. Three observations:
1. My 7400 doesn't work at all with other brands of after market magazines. Remington four shot magazines are 100% reliable. Another thing about the magazines. The 7600 and 7400 magazines are nearly the same with the only difference being a squared back on the 7400 follower "hump". This squared back prevents the 7400 bolt closing on an empty chamber. This is really awkward because the bolt is in tension against the magazine, and jams and locks the magazine in the rifle. To clear it, you need to hold the bolt back, under tension, with one hand, hold the rifle with the other hand, and then using your third hand, push the latch and remove the magazine. The 7600 magazines do not have the follower lock and the bolt slides home over the follower. To avoid all of this, I just bought extra 7600 magazines and use them in the 7400.
2. The trigger is spongey, i.e. awful. Although with practice, you can somewhat get used to it.
3. Everyone will tell you this, and I'm sure you are aware of it, but the 7400 is not an M1A or an AR10. It's a hunting rifle, not a battle rifle, and so do not expect the same kind of durability.
Overall, I'm satisfied with mine. However, if I were starting over and looking for a "non-black" auto loading rifle for hunting, I would probably choose the Browning.